Hey Aspirant,
After 12th you can pursue LLB Integrated course directly like B.A.LL.B, BB.A.LL.B., B.Com.LL.B., B.Sc.LL.B., B.S.W.LL.B. Integrated Law course is a 5-years course.
For pursuing this course you have to pass 12th examinations from any recognized school or board. And you have to score minimum 50% marks (45% marks for SC/ST) in the qualifying examinations (12th).
Good Luck!

Hello,Aspirant

For pursuing the LLB you need to clear the CLAT (Common Law Admission Test) for which you need to fulfil the some criteria i.e.: 

• You must have a higher secondary school degree or an equivalent degree with any discipline from a recognized institute with at least 45% aggregate.
• Your age must be within 20 years.

Hope this helps.